expr.c 17 KB
Newer Older
1
#include <config.h>
Arturo Espinosa's avatar
Arturo Espinosa committed
2
#include <gnome.h>
Arturo Espinosa's avatar
Arturo Espinosa committed
3
#include <math.h>
4
#include <string.h>
Arturo Espinosa's avatar
Arturo Espinosa committed
5
#include "gnumeric.h"
Arturo Espinosa's avatar
Arturo Espinosa committed
6
#include "expr.h"
Arturo Espinosa's avatar
Arturo Espinosa committed
7
#include "eval.h"
8 9

char *parser_expr;
10
ParseErr parser_error;
11 12
ExprTree *parser_result;
int parser_col, parser_row;
13

14 15
ExprTree *
expr_parse_string (char *expr, int col, int row, char **error_msg)
16 17
{
	parser_expr = expr;
18
	parser_error = PARSE_OK;
19 20 21
	parser_col = col;
	parser_row = row;
		
22
	yyparse ();
23 24 25
	switch (parser_error){
	case PARSE_OK:
		*error_msg = NULL;
26
		parser_result->ref_count = 1;
Arturo Espinosa's avatar
Arturo Espinosa committed
27
		return parser_result;
28

Arturo Espinosa's avatar
Arturo Espinosa committed
29 30 31 32
	case PARSE_ERR_SYNTAX:
		*error_msg = _("Syntax error");
		break;
			
33 34 35 36
	case PARSE_ERR_NO_QUOTE:
		*error_msg = _("Missing quote");
		break;
	}
37 38 39
	return NULL;
}

Arturo Espinosa's avatar
Arturo Espinosa committed
40 41
static void
do_expr_tree_ref (ExprTree *tree)
42
{
43
	g_return_if_fail (tree != NULL);
Arturo Espinosa's avatar
Arturo Espinosa committed
44 45 46
	g_return_if_fail (tree->ref_count > 0);

	tree->ref_count++;
47
	switch (tree->oper){
48
	case OP_VAR:
49
	case OP_CONSTANT:
50 51 52
	case OP_FUNCALL:
		break;

53 54 55 56 57 58
	case OP_EQUAL:
	case OP_GT:
	case OP_LT:
	case OP_GTE:
	case OP_LTE:
	case OP_NOT_EQUAL:
59 60 61 62 63 64
	case OP_ADD:
	case OP_SUB:
	case OP_MULT:
	case OP_DIV:
	case OP_EXP:
	case OP_CONCAT:
Arturo Espinosa's avatar
Arturo Espinosa committed
65 66
		do_expr_tree_ref (tree->u.binary.value_a);
		do_expr_tree_ref (tree->u.binary.value_b);
67 68 69
		break;

	case OP_NEG:
Arturo Espinosa's avatar
Arturo Espinosa committed
70
		do_expr_tree_ref (tree->u.value);
71 72 73 74
		break;
	}
}

Arturo Espinosa's avatar
Arturo Espinosa committed
75 76 77 78
/*
 * expr_tree_ref:
 * Increments the ref_count for part of a tree
 */
79 80 81 82 83 84
void
expr_tree_ref (ExprTree *tree)
{
	g_return_if_fail (tree != NULL);
	g_return_if_fail (tree->ref_count > 0);

Arturo Espinosa's avatar
Arturo Espinosa committed
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128
	do_expr_tree_ref (tree);
}

static void
do_expr_tree_unref (ExprTree *tree)
{
	tree->ref_count--;
	switch (tree->oper){
	case OP_VAR:
		break;
		
	case OP_CONSTANT:
		if (tree->ref_count == 0)
			value_release (tree->u.constant);
		break;
		
	case OP_FUNCALL:
		if (tree->ref_count == 0)
			symbol_unref (tree->u.function.symbol);
		break;

	case OP_EQUAL:
	case OP_GT:
	case OP_LT:
	case OP_GTE:
	case OP_LTE:
	case OP_NOT_EQUAL:
	case OP_ADD:
	case OP_SUB:
	case OP_MULT:
	case OP_DIV:
	case OP_EXP:
	case OP_CONCAT:
		do_expr_tree_unref (tree->u.binary.value_a);
		do_expr_tree_unref (tree->u.binary.value_b);
		break;

	case OP_NEG:
		do_expr_tree_unref (tree->u.value);
		break;
	}
	
	if (tree->ref_count == 0)
		g_free (tree);
129 130 131 132 133 134 135 136
}

void
expr_tree_unref (ExprTree *tree)
{
	g_return_if_fail (tree != NULL);
	g_return_if_fail (tree->ref_count > 0);

Arturo Espinosa's avatar
Arturo Espinosa committed
137
	do_expr_tree_unref (tree);
138 139 140 141 142
}

void
value_release (Value *value)
{
Arturo Espinosa's avatar
Arturo Espinosa committed
143 144
	g_return_if_fail (value != NULL);
	
145 146 147 148 149 150 151
	switch (value->type){
	case VALUE_STRING:
		string_unref (value->v.str);
		break;

	case VALUE_INTEGER:
		mpz_clear (value->v.v_int);
152 153
		break;
		
154 155 156 157
	case VALUE_FLOAT:
		mpf_clear (value->v.v_float);
		break;

Arturo Espinosa's avatar
Arturo Espinosa committed
158 159 160 161 162 163 164 165 166 167 168
	case VALUE_ARRAY: {
		GList *l;

		for (l = value->v.array; l; l = l->next)
			value_release (l->data);
		g_list_free (l);
	}
	
	case VALUE_CELLRANGE:
		break;
		
169
	}
Arturo Espinosa's avatar
Arturo Espinosa committed
170
	g_free (value);
171
}
172

Arturo Espinosa's avatar
Arturo Espinosa committed
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
/*
 * Copies a Value.
 */
void
value_copy_to (Value *dest, Value *source)
{
	g_return_if_fail (dest != NULL);
	g_return_if_fail (source != NULL);

	dest->type = source->type;
	
	switch (source->type){
	case VALUE_STRING:
		dest->v.str = source->v.str;
		string_ref (dest->v.str);
		break;

	case VALUE_INTEGER:
		dest->v.v_int = source->v.v_int;
		break;

	case VALUE_FLOAT:
		dest->v.v_float = source->v.v_float;
		break;

Arturo Espinosa's avatar
Arturo Espinosa committed
198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213
	case VALUE_ARRAY: {
		GList *l, *new = NULL;

		for (l = source->v.array; l; l = l->next){
			Value *copy;

			copy = value_duplicate (l->data);
			
			new = g_list_append (new, copy);
		}
		dest->v.array = new;
		break;
	}
	case VALUE_CELLRANGE:
		dest->v.cell_range = source->v.cell_range;
		break;
Arturo Espinosa's avatar
Arturo Espinosa committed
214 215 216
	}
}

Arturo Espinosa's avatar
Arturo Espinosa committed
217 218 219 220 221 222 223 224 225 226 227 228 229 230 231
/*
 * Makes a copy of a Value
 */
Value *
value_duplicate (Value *value)
{
	Value *new_value;

	g_return_val_if_fail (value != NULL, NULL);
	new_value = g_new (Value, 1);
	value_copy_to (new_value, value);
	
	return new_value;
}

Arturo Espinosa's avatar
Arturo Espinosa committed
232 233 234 235
/*
 * Casts a value to float if it is integer, and returns
 * a new Value * if required
 */
236
Value *
237
value_cast_to_float (Value *v)
Arturo Espinosa's avatar
Arturo Espinosa committed
238 239 240 241 242 243 244 245 246 247 248
{
	Value *newv;
	
	g_return_val_if_fail (VALUE_IS_NUMBER (v), NULL);

	if (v->type == VALUE_FLOAT)
		return v;
	
	newv = g_new (Value, 1);
	newv->type = VALUE_FLOAT;
	mpf_set_z (newv->v.v_float, v->v.v_int);
249
	value_release (v);
Arturo Espinosa's avatar
Arturo Espinosa committed
250 251 252 253
	
	return newv;
}

Arturo Espinosa's avatar
Arturo Espinosa committed
254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280
int
value_get_bool (Value *v, int *err)
{
	*err = 0;

	if (v->type == VALUE_STRING)
		return atoi (v->v.str->str);

	if (v->type == VALUE_CELLRANGE){
		*err = 1;
		return 0;
	}

	if (v->type == VALUE_INTEGER)
		return v->v.v_int != 0;

	if (v->type == VALUE_FLOAT)
		return v->v.v_float != 0.0;

	if (v->type == VALUE_ARRAY)
		return 0;
	
	g_warning ("Unhandled value in value_get_boolean");

	return 0;
}

Arturo Espinosa's avatar
Arturo Espinosa committed
281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
float_t
value_get_as_double (Value *v)
{
	if (v->type == VALUE_STRING){
		return atof (v->v.str->str);
	}

	if (v->type == VALUE_CELLRANGE){
		g_warning ("Getting range as a double: what to do?");
		return 0.0;
	}

	if (v->type == VALUE_INTEGER)
		return (float_t) v->v.v_int;

Arturo Espinosa's avatar
Arturo Espinosa committed
296 297 298
	if (v->type == VALUE_ARRAY)
		return 0.0;
	
Arturo Espinosa's avatar
Arturo Espinosa committed
299
	return (float_t) v->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
300 301
}

Arturo Espinosa's avatar
Arturo Espinosa committed
302 303
static Value *
eval_cell_value (Sheet *sheet, Value *value)
304
{
Arturo Espinosa's avatar
Arturo Espinosa committed
305
	Value *res;
306

Arturo Espinosa's avatar
Arturo Espinosa committed
307 308 309 310 311 312
	res = g_new (Value, 1);
	res->type = value->type;
	
	switch (res->type){
	case VALUE_STRING:
		res->v.str = value->v.str;
313
		string_ref (res->v.str);
Arturo Espinosa's avatar
Arturo Espinosa committed
314 315 316
		break;
		
	case VALUE_INTEGER:
317
		res->v.v_int = value->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
318 319 320
		break;
		
	case VALUE_FLOAT:
321
		res->v.v_float = value->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
322
		break;
Arturo Espinosa's avatar
Arturo Espinosa committed
323 324 325 326 327 328 329

	case VALUE_ARRAY:
		g_warning ("VALUE_ARRAY not handled in eval_cell_value\n");
		res->type = VALUE_INTEGER;
		res->v.v_int = 0;
		break;
			
Arturo Espinosa's avatar
Arturo Espinosa committed
330 331 332 333 334 335 336
	case VALUE_CELLRANGE:
		res->v.cell_range = value->v.cell_range;
		break;
	}
	return res;
}

Arturo Espinosa's avatar
Arturo Espinosa committed
337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379
static Value *
eval_funcall (Sheet *sheet, ExprTree *tree, int eval_col, int eval_row, char **error_string)
{
	FunctionDefinition *fd;
	GList *l;
	int argc, arg, i;
	Value *v;
	
	fd = (FunctionDefinition *) tree->u.function.symbol->data;
	
	l = tree->u.function.arg_list;
	argc = g_list_length (l);

	if (fd->expr_fn)
	{
		/* Functions that deal with ExprNodes */
		v = fd->expr_fn (sheet, l, eval_col, eval_row, error_string);
	}
	else
	{
		/* Functions that take pre-computed Values */
		Value **values;
		int fn_argc;
		char *arg_type = fd->args;
		
		fn_argc = strlen (fd->args);
		
		if (fn_argc != argc){
			*error_string = _("Invalid number of arguments");
			return NULL;
		}

		values = g_new (Value *, argc);
		
		for (arg = 0; l; l = l->next, arg++, arg_type++){
			ExprTree *t = (ExprTree *) l->data;
			
			v = eval_expr (sheet, t, eval_col, eval_row, error_string);
			if (v == NULL)
				goto free_list;
			
			values [arg] = v;
		}
380
		v = fd->fn (values, error_string);
Arturo Espinosa's avatar
Arturo Espinosa committed
381 382 383 384 385 386 387 388 389 390

	free_list:
		for (i = 0; i < arg; i++)
			value_release (values [i]);
		g_free (values);
		return v;
	}
	return v;
}

391
typedef enum {
Arturo Espinosa's avatar
Arturo Espinosa committed
392 393
	IS_EQUAL,
	IS_LESS,
394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418
	IS_GREATER,
	TYPE_ERROR
} compare_t;

static compare_t
compare_int_int (int a, int b)
{
	if (a == b)
		return IS_EQUAL;
	else if (a < b)
		return IS_LESS;
	else
		return IS_GREATER;
}

static compare_t
compare_float_float (float_t a, float_t b)
{
	if (a == b)
		return IS_EQUAL;
	else if (a < b)
		return IS_LESS;
	else
		return IS_GREATER;
}
Arturo Espinosa's avatar
Arturo Espinosa committed
419

420 421 422 423
/*
 * Compares two (Value *) and returns one of compare_t
 */
static compare_t
Arturo Espinosa's avatar
Arturo Espinosa committed
424 425
compare (Value *a, Value *b)
{
426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476
	if (a->type == VALUE_INTEGER){
		int f;
		
		switch (b->type){
		case VALUE_INTEGER:
			return compare_int_int (a->v.v_int, b->v.v_int);

		case VALUE_FLOAT:
			return compare_float_float (a->v.v_int, b->v.v_float);

		case VALUE_STRING:
			f = value_get_as_double (b);
			return compare_float_float (a->v.v_int, f);

		default:
			return TYPE_ERROR;
		}
	}
	
	if (a->type == VALUE_FLOAT){
		float_t f;

		switch (b->type){
		case VALUE_INTEGER:
			return compare_float_float (a->v.v_float, b->v.v_int);

		case VALUE_FLOAT:
			return compare_float_float (a->v.v_float, b->v.v_float);

		case VALUE_STRING:
			f = value_get_as_double (b);
			return compare_float_float (a->v.v_float, f);

		default:
			return TYPE_ERROR;
		}
	}

	if (a->type == VALUE_STRING && b->type == VALUE_STRING){
		int t;

		t = strcasecmp (a->v.str->str, b->v.str->str);
		if (t == 0)
			return IS_EQUAL;
		else if (t > 0)
			return IS_GREATER;
		else
			return IS_LESS;
	}

	return TYPE_ERROR;
Arturo Espinosa's avatar
Arturo Espinosa committed
477 478
}

Arturo Espinosa's avatar
Arturo Espinosa committed
479
Value *
480
eval_expr (void *asheet, ExprTree *tree, int eval_col, int eval_row, char **error_string)
Arturo Espinosa's avatar
Arturo Espinosa committed
481 482 483
{
	Value *a, *b, *res;
	Sheet *sheet = asheet;
Arturo Espinosa's avatar
Arturo Espinosa committed
484 485 486 487 488

	g_return_val_if_fail (tree != NULL, NULL);
	g_return_val_if_fail (asheet != NULL, NULL);
	g_return_val_if_fail (error_string != NULL, NULL);
	g_return_val_if_fail (IS_SHEET (asheet), NULL);
Arturo Espinosa's avatar
Arturo Espinosa committed
489
	
490
	switch (tree->oper){
Arturo Espinosa's avatar
Arturo Espinosa committed
491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514
	case OP_EQUAL:
	case OP_NOT_EQUAL:
	case OP_GT:
	case OP_GTE:
	case OP_LT:
	case OP_LTE: {
		int comp;
		
		a = eval_expr (sheet, tree->u.binary.value_a,
			       eval_col, eval_row, error_string);
		b = eval_expr (sheet, tree->u.binary.value_b,
			       eval_col, eval_row, error_string);
		if (!(a && b)){
			if (a)
				value_release (a);
			if (b)
				value_release (b);
			return NULL;
		}
		res = g_new (Value, 1);
		res->type = VALUE_INTEGER;

		comp = compare (a, b);

515 516 517 518 519 520 521
		if (comp == TYPE_ERROR){
			value_release (a);
			value_release (b);
			*error_string = _("Type error");
			return NULL;
		}
		
Arturo Espinosa's avatar
Arturo Espinosa committed
522 523 524 525 526 527
		switch (tree->oper){
		case OP_EQUAL:
			res->v.v_int = comp == IS_EQUAL;
			break;

		case OP_GT:
528
			res->v.v_int = comp == IS_GREATER;
Arturo Espinosa's avatar
Arturo Espinosa committed
529 530 531 532 533 534 535 536 537 538 539
			break;

		case OP_LT:
			res->v.v_int = comp == IS_LESS;
			break;

		case OP_LTE:
			res->v.v_int = (comp == IS_EQUAL || comp == IS_LESS);
			break;

		case OP_GTE:
540
			res->v.v_int = (comp == IS_EQUAL || comp == IS_GREATER);
Arturo Espinosa's avatar
Arturo Espinosa committed
541 542 543 544 545 546 547 548 549 550 551 552 553 554
			break;

		case OP_NOT_EQUAL:
			res->v.v_int = comp != IS_EQUAL;
			break;
			
		default:
			g_warning ("This should never be reached: comparission ops\n");
		}
		value_release (a);
		value_release (b);
		return res;
	}
	
Arturo Espinosa's avatar
Arturo Espinosa committed
555 556 557 558 559
	case OP_ADD:
	case OP_SUB:
	case OP_MULT:
	case OP_DIV:
	case OP_EXP:
560 561 562 563
		a = eval_expr (sheet, tree->u.binary.value_a,
			       eval_col, eval_row, error_string);
		b = eval_expr (sheet, tree->u.binary.value_b,
			       eval_col, eval_row, error_string);
Arturo Espinosa's avatar
Arturo Espinosa committed
564 565 566

		if (!(a && b)){
			if (a)
567
				value_release (a);
Arturo Espinosa's avatar
Arturo Espinosa committed
568
			if (b)
569
				value_release (b);
Arturo Espinosa's avatar
Arturo Espinosa committed
570 571 572 573
			return NULL;
		}
		
		if (!VALUE_IS_NUMBER (a) || !VALUE_IS_NUMBER (b)){
574 575
			value_release (a);
			value_release (b);
Arturo Espinosa's avatar
Arturo Espinosa committed
576 577 578 579 580 581 582 583
			*error_string = _("Type mismatch");
			return NULL;
		}
		
		res = g_new (Value, 1);
		if (a->type == VALUE_INTEGER && b->type == VALUE_INTEGER){
			res->type = VALUE_INTEGER;
			
584
			switch (tree->oper){
Arturo Espinosa's avatar
Arturo Espinosa committed
585
			case OP_ADD:
Arturo Espinosa's avatar
Arturo Espinosa committed
586
				res->v.v_int = a->v.v_int + b->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
587 588 589
				break;
				
			case OP_SUB:
Arturo Espinosa's avatar
Arturo Espinosa committed
590
				res->v.v_int = a->v.v_int - b->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
591 592 593
				break;
				
			case OP_MULT:
Arturo Espinosa's avatar
Arturo Espinosa committed
594
				res->v.v_int = a->v.v_int * b->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
595
				break;
Arturo Espinosa's avatar
Arturo Espinosa committed
596

Arturo Espinosa's avatar
Arturo Espinosa committed
597
			case OP_DIV:
Arturo Espinosa's avatar
Arturo Espinosa committed
598
				if (b->v.v_int == 0){
599 600 601
					value_release (a);
					value_release (b);
					value_release (res);
Arturo Espinosa's avatar
Arturo Espinosa committed
602 603 604 605
					*error_string = _("Division by zero");
					return NULL;
				}
					
Arturo Espinosa's avatar
Arturo Espinosa committed
606
				res->v.v_int =  a->v.v_int / b->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
607 608
				break;
				
Arturo Espinosa's avatar
Arturo Espinosa committed
609 610
			case OP_EXP: 
				res->v.v_int = pow (a->v.v_int, b->v.v_int);
Arturo Espinosa's avatar
Arturo Espinosa committed
611 612 613 614 615
				break;
			default:
			}
		} else {
			res->type = VALUE_FLOAT;
Arturo Espinosa's avatar
Arturo Espinosa committed
616
			res->v.v_float = 0.0;
617 618
			a = value_cast_to_float (a);
			b = value_cast_to_float (b);
Arturo Espinosa's avatar
Arturo Espinosa committed
619
			
620
			switch (tree->oper){
Arturo Espinosa's avatar
Arturo Espinosa committed
621
			case OP_ADD:
Arturo Espinosa's avatar
Arturo Espinosa committed
622
				res->v.v_float = a->v.v_float + b->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
623 624 625
				break;
				
			case OP_SUB:
Arturo Espinosa's avatar
Arturo Espinosa committed
626
				res->v.v_float = a->v.v_float - b->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
627 628 629
				break;
				
			case OP_MULT:
Arturo Espinosa's avatar
Arturo Espinosa committed
630
				res->v.v_float = a->v.v_float * b->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
631 632 633
				break;
				
			case OP_DIV:
Arturo Espinosa's avatar
Arturo Espinosa committed
634
				if (b->v.v_float == 0.0){
635 636 637
					value_release (a);
					value_release (b);
					value_release (res);
Arturo Espinosa's avatar
Arturo Espinosa committed
638 639 640
					*error_string = _("Division by zero");
					return NULL;
				}
Arturo Espinosa's avatar
Arturo Espinosa committed
641 642

				res->v.v_float = a->v.v_float / b->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
643 644 645
				break;
				
			case OP_EXP:
Arturo Espinosa's avatar
Arturo Espinosa committed
646
				res->v.v_float = pow (a->v.v_float, b->v.v_float);
Arturo Espinosa's avatar
Arturo Espinosa committed
647 648 649 650
				break;
			default:
			}
		}
651 652
		value_release (a);
		value_release (b);
Arturo Espinosa's avatar
Arturo Espinosa committed
653 654
		return res;
		
655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
	case OP_CONCAT: {
		char *sa, *sb, *tmp;

		a = eval_expr (sheet, tree->u.binary.value_a,
			       eval_col, eval_row, error_string);
		if (!a)
			return NULL;
		b = eval_expr (sheet, tree->u.binary.value_b,
			       eval_col, eval_row, error_string);
		if (!b){
			value_release (a);
			return NULL;
		}

		res = g_new (Value, 1);
		res->type = VALUE_STRING;
		sa = value_string (a);
		sb = value_string (b);
		
		tmp = g_copy_strings (sa, sb, NULL);
		res->v.str = string_get (tmp);
		g_free (sa);
		g_free (sb);
		g_free (tmp);

		value_release (a);
		value_release (b);
		return res;
	}
Arturo Espinosa's avatar
Arturo Espinosa committed
684 685

	case OP_FUNCALL:
Arturo Espinosa's avatar
Arturo Espinosa committed
686
		return eval_funcall (sheet, tree, eval_col, eval_row, error_string);
Arturo Espinosa's avatar
Arturo Espinosa committed
687 688

	case OP_CONSTANT:
689
		return eval_cell_value (sheet, tree->u.constant);
Arturo Espinosa's avatar
Arturo Espinosa committed
690 691

	case OP_VAR:{
692
		CellRef *ref;
Arturo Espinosa's avatar
Arturo Espinosa committed
693 694 695 696 697 698 699 700 701 702 703 704 705
		Cell *cell;
		int col, row;
		
		if (sheet == NULL){
			/* Only the test program requests this */
			res = g_new (Value, 1);

			res->type = VALUE_FLOAT;
			res->v.v_float = 3.14;
			
			return res;
		}

706
		ref = &tree->u.constant->v.cell;
Arturo Espinosa's avatar
Arturo Espinosa committed
707
		cell_get_abs_col_row (&tree->u.constant->v.cell, eval_col, eval_row, &col, &row);
708
		
Arturo Espinosa's avatar
Arturo Espinosa committed
709
		cell = sheet_cell_get (sheet, col, row);
710 711 712 713 714 715

		if (cell && cell->value){
			if (cell->parsed_node && cell->generation != sheet->workbook->generation){
				cell->generation = sheet->workbook->generation;
				cell_eval (cell);
			} 
Arturo Espinosa's avatar
Arturo Espinosa committed
716
			
717 718
			if (cell->value)
				return eval_cell_value (sheet, cell->value);
Arturo Espinosa's avatar
Arturo Espinosa committed
719
		}
720 721 722 723
		res = g_new (Value, 1);
			
		res->type = VALUE_INTEGER;
		res->v.v_int = 0;
Arturo Espinosa's avatar
Arturo Espinosa committed
724 725 726
		return res;
	}
	case OP_NEG:
727 728
		a = eval_expr (sheet, tree->u.value,
			       eval_col, eval_row, error_string);
Arturo Espinosa's avatar
Arturo Espinosa committed
729 730 731 732
		if (!a)
			return NULL;
		if (!VALUE_IS_NUMBER (a)){
			*error_string = _("Type mismatch");
733
			value_release (a);
Arturo Espinosa's avatar
Arturo Espinosa committed
734 735 736
			return NULL;
		}
		res = g_new (Value, 1);
737
		res->type = a->type;
Arturo Espinosa's avatar
Arturo Espinosa committed
738
		if (a->type == VALUE_INTEGER){
Arturo Espinosa's avatar
Arturo Espinosa committed
739
			res->v.v_int = -a->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
740
		} else {
Arturo Espinosa's avatar
Arturo Espinosa committed
741
			res->v.v_float = -a->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
742
		}
743
		value_release (a);
Arturo Espinosa's avatar
Arturo Espinosa committed
744
		return res;
745
	}
Arturo Espinosa's avatar
Arturo Espinosa committed
746 747 748
	
	*error_string = _("Unknown evaluation error");
	return NULL;
749
}
Arturo Espinosa's avatar
Arturo Espinosa committed
750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766

void
cell_get_abs_col_row (CellRef *cell_ref, int eval_col, int eval_row, int *col, int *row)
{
	g_return_if_fail (cell_ref != NULL);

	if (cell_ref->col_relative)
		*col = eval_col + cell_ref->col;
	else
		*col = cell_ref->col;

	if (cell_ref->row_relative)
		*row = eval_row + cell_ref->row;
	else
		*row = cell_ref->row;
}

767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789
static int
evaluate_level (Operation x)
{
	if (x == OP_EXP)
		return 3;
	if ((x==OP_MULT) || (x==OP_DIV))
		return 2;
	if ((x==OP_ADD)  || (x==OP_SUB)   || (x==OP_CONCAT))
		return 1;
	return 0;
}

static int
bigger_prec (Operation parent, Operation this)
{
	int parent_level, this_level;

	parent_level = evaluate_level (parent);
	this_level   = evaluate_level (this);

	return parent_level > this_level;
}

790 791 792 793 794 795 796 797 798
/*
 * Converts a parsed tree into its string representation
 * assuming that we are evaluating at col, row (This is
 * only used during copying to "render" a new text
 * representation for a copied cell.
 *
 * This routine is pretty simple: it walks the ExprTree and
 * create a string representation.
 */
799 800
static char *
do_expr_decode_tree (ExprTree *tree, int col, int row, Operation parent_op)
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
{
	static const char *binary_operation_names [] = {
		"=", ">", "<", ">=", "<=", "<>",
		"+", "-", "*", "/",  "^",  "&"
	};

	switch (tree->oper){

		/* The binary operations */
	case OP_EQUAL:
	case OP_NOT_EQUAL:
	case OP_GT:
	case OP_GTE:
	case OP_LT:
	case OP_LTE:
	case OP_ADD:
	case OP_SUB:
	case OP_MULT:
	case OP_DIV:
	case OP_EXP:
	case OP_CONCAT: {	
		char *a, *b, *res;
		char const *op;
		
825 826
		a = do_expr_decode_tree (tree->u.binary.value_a, col, row, tree->oper);
		b = do_expr_decode_tree (tree->u.binary.value_b, col, row, tree->oper);
827
		op = binary_operation_names [tree->oper];
828 829 830 831 832 833

		if (bigger_prec (parent_op, tree->oper))
			res = g_copy_strings ("(", a, op, b, ")", NULL);
		else
			res = g_copy_strings (a, op, b, NULL);
		
834 835 836 837 838 839 840 841
		g_free (a);
		g_free (b);
		return res;
	}
	
	case OP_NEG: {
		char *res, *a;

842
		a = do_expr_decode_tree (tree->u.value, col, row, tree->oper);
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866
		res = g_copy_strings ("-", a);
		g_free (a);
		return res;
	}
	
	case OP_FUNCALL: {
		FunctionDefinition *fd;
		GList *arg_list, *l;
		char *res, *sum;
		char **args;
		int  argc;

		fd = tree->u.function.symbol->data;
		arg_list = tree->u.function.arg_list;
		argc = g_list_length (arg_list);

		if (argc){
			int i, len = 0;
			args = g_malloc (sizeof (char *) * argc);

			i = 0;
			for (l = arg_list; l; l = l->next){
				ExprTree *t = l->data;
				
867
				args [i] = do_expr_decode_tree (t, col, row, OP_CONSTANT);
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917
				len += strlen (args [i]) + 1;
			}
			len++;
			sum = g_malloc (len + 1);
			
			i = 0;
			sum [0] = 0;
			for (l = arg_list; l; l = l->next)
				strcat (sum, args [i]);

			res = g_copy_strings (
				fd->name, "(", sum, ")", NULL);

			for (i = 0; i < argc; i++)
				g_free (args [i]);
			g_free (args);

			return res;
		} else
			return g_copy_strings (fd->name, "()", NULL);
	}
	
	case OP_CONSTANT: {
		Value *v = tree->u.constant;

		if (v->type == VALUE_CELLRANGE){
			char buffer_a [20], buffer_b [20], *a;

			a = cellref_name (&v->v.cell_range.cell_a, col, row);
			strcpy (buffer_a, a);
			a = cellref_name (&v->v.cell_range.cell_b, col, row);
			strcpy (buffer_b, a);

			return g_copy_strings (buffer_a, ":", buffer_b, NULL);
		} else
			return value_string (v);
	}
	
	case OP_VAR: {
		CellRef *cell_ref;

		cell_ref = &tree->u.constant->v.cell;
		return g_strdup (cellref_name (cell_ref, col, row));
	}
	}

	g_warning ("ExprTree: This should not happen\n");
	return g_strdup ("0");
}

918 919 920 921
char *
expr_decode_tree (ExprTree *tree, int col, int row)
{
	g_return_val_if_fail (tree != NULL, NULL);
922

923 924
	return do_expr_decode_tree (tree, col, row, OP_CONSTANT);
}